Ilya Efimov Production (now operating as Efimov Audio) is a Russian developer of virtual instruments and Kontakt sample libraries founded by composer, arranger, and producer Ilya Efimov. The company emerged from Efimov's decades of work scoring film, television, and musical theater, and specializes in deeply sampled instruments — many of them folk and ethnic instruments rarely captured at this level of detail.

The catalog spans plucked strings, basses, keys, winds, and ethnic instruments, including acoustic, nylon, Les Paul–style and Telecaster-style electric guitars, Modern, Classic, Rock, Retro and Fretless basses modeled on Fender Precision and Jazz designs, accordion, bayan, and barrel organ, and a deep set of folk instruments like balalaika, domra, duduk, Russian zhaleika, Uilleann pipes, and Irish low and tin whistles. Libraries are typically built around heavy per-fret, per-string velocity layering and articulation systems covering legato, slides, vibrato, mordents, and other performance details.

The libraries are used widely in film, TV, and game scoring, and the company highlights endorsements from composers and producers including Jordan Rudess, Thomas Newman, Rupert Gregson-Williams, and Ludwig Göransson. Within the Kontakt sample library community, the brand is best known for its bass and acoustic guitar instruments and for bringing playable, well-scripted versions of Eastern European and Celtic folk instruments into mainstream production workflows.

Ilya Efimov has 3 products cataloged on Equipboard, including Kontakt Instrument.